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Note: This thread is no longer updated. You can find the latest info HERE.

Notice: Make sure you have downloaded the correct Mod for your specific model and that the laptop's or a UPS battery backup is present during the update process.

Disclaimer: I do not hold any responsibility for any problems that may occur by using the mods in a wrong way. Remember that you flash these at your own risk. I have personally tested the W25xHNx mod. Since the laptops mentioned here are of the same series and thus almost identical, you shouldn't face any problems with the rest of them. The same changes were made to all models after ensuring that their stock counterparts are identical to the tested W25xHNx laptop.

Note: All mods contain both the Modded and Stock BIOS image files so that you can go back in case you want to. Use Mod.bat or Stock.bat at a DOS environment respectively. Check the Flashing Guide below for detailed instructions.

1. Create a bootable MSDOS/FreeDOS USB flash-drive using Rufus
2. Copy all files relevant to your model at the USB flash-drive's root directory
3. Plug the USB flash drive at your laptop's USB 2.0 port
4. Restart and press F2 to enter BIOS to make sure that you do not have any BIOS or HDD password protection
5. Restart and press F7 to enter the Boot Order menu at which select your USB flash drive
6a. To update your BIOS & EC to the latest modded version, type Mod
6b. To update your BIOS & EC to the latest stock version, type Stock
7. Follow the easy on-screen prompts to finish the update process
8. The first time after the update, the laptop will boot and automatically restart quickly
9. Press F2 to enter BIOS and Load Setup Defaults followed by Save Changes and Reset
10. You have successfully updated your BIOS & EC to the latest modded/stock versions

Which one of the above is the official website dedicated to Prema BIOS mod and why they all seem dead? Including the last one - according to TechInferno, Prema's last visit here was on Dec 2, 2016. Is Prema long done with creating custom firmware?

I think I have a Clevo W942SW rebranded as a Positivo Master N250i in Brazil. I'm pretty sure it's a Clevo W942SW because even some Clevo manuals about this model carries the "POSITIVO" brand in pictures. And everything else matches perfectly, as I could perceive.

Well, it has a "Aptio 4" BIOS from what I could see, and the stock BIOS is pretty damn locked up

Here's what it looks like from the AFUWIN program:
https://imgur.com/a/Vd71t

And here's the BIOS dump, I think:
https://www.sendspace.com/file/zp0ywq

Any information would be very nice about if it's possible to unlock/mod this or not.
Thanks!